The main indicators to look for in a routine blood test for pneumonia are white blood cell count and neutrophil ratio. 1. White blood cell count: white blood cell count is one of the indicators that patients with pneumonia should pay attention to in routine blood tests, which can initially determine whether the patient is infected or not. 2. Neutrophil ratio: For patients with pneumonia, an abnormally high neutrophil count suggests that a bacterial infection may be present. 3. Other factors such as lymphocytes, eosinophils, basophils, etc. are helpful in determining the pathogen of infection. Although routine blood tests can provide a basic diagnosis of pneumonia and confirm whether the lungs are infected or not, routine blood tests alone cannot provide a definitive diagnosis of pneumonia, and the condition needs to be clarified by sputum culture, X-ray chest X-ray, and other further tests, and individuals should actively cooperate with the doctor to do a good job in the examination and diagnosis of the disease and its treatment.